{"classifier_version":"1.4.0","documentation":"https://rirtracker.com/api/","disclaimer":"This site independently analyzes publicly available Internet number-resource records. It is not affiliated with or endorsed by ARIN, the RIPE NCC, APNIC, LACNIC, AFRINIC, the Number Resource Organization (NRO), or any other Regional Internet Registry. Classifications and hold-expiration dates are evidence-based interpretations and do not constitute confirmation that a resource is available for issuance or transfer.","resource":"170.4.176.0/20","resource_type":"ipv4","page":"https://rirtracker.com/ip/170.4.176.0-170.4.191.255/","statistics_now":{"registry":"ARIN","status":"allocated (dated 2023-06-23)"},"current_holder":{"rir":"ARIN","org":"SEI Data, Inc.","how":"ARIN's latest statistics and the latest transfer record"},"rdap_snapshots":[],"transfers":[{"id":32285,"date":"2023-06-23T12:13:38Z","type":"RESOURCE_TRANSFER","source_rir":"ARIN","recipient_rir":"ARIN","source_org":"United States Steel Corporation","recipient_org":"SEI Data, Inc.","range":"170.4.176.0/20","log":"ARIN"}],"events":[{"event_id":"7a5257579f63cf45","registry":"ARIN","report_date":"2023-06-23","source":"arin_issued","raw_action":"ADD","raw_line":"Add 170.4.176.0-170.4.191.255","resource_type":"ipv4","resource":"170.4.176.0/20","start":"170.4.176.0","end":"170.4.191.255","classification":"INTRA_RIR_TRANSFER","classification_label":"Intra-ARIN transfer","confidence":"CONFIRMED","source_rir":"ARIN","recipient_rir":"ARIN","source_organization":"United States Steel Corporation","recipient_organization":"SEI Data, Inc.","inventory_effect":"No effect on ARIN applicant inventory","inventory_effect_code":"NO_EFFECT","provisional":false,"classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:45+00:00","page":"https://rirtracker.com/ip/170.4.176.0-170.4.191.255/#e-7a5257579f63cf45","report_page":"https://rirtracker.com/arin/reports/2023-06-23/","evidence_url":"https://rirtracker.com/api/v1/resources/ip/170.4.176.0-170.4.191.255.json","piece_of":{"resource":"170.4.0.0/16","page":"https://rirtracker.com/ip/170.4.0.0-170.4.255.255/"},"explanation":"ARIN's transfer log records a transfer from United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN) on 2023-06-23 12:13 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN.","evidence":[{"type":"arin_issued","url":"https://lists.arin.net/pipermail/arin-issued/2023-June/005306.html","retrieved_at":"2026-10-12T18:42:12+00:00","summary":"ARIN-Issued report for 2023-06-23: \"Add 170.4.176.0-170.4.191.255\""},{"type":"transfer","url":"https://ftp.arin.net/pub/stats/arin/transfers/transfers_latest.json","retrieved_at":"2026-10-13T13:57:20+00:00","summary":"Transfer log: RESOURCE_TRANSFER on 2023-06-23 12:13 UTC, United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN); resources moved: 170.4.176.0/20"},{"type":"delegated_before","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230622.gz","retrieved_at":"2026-10-12T23:22:44+00:00","summary":"ARIN delegated statistics 2023-06-22 (produced 2023-06-22T13:00:12+00:00), before the report: allocated (dated 1993-12-02)"},{"type":"delegated_after","url":"https://ftp.arin.net/pub/stats/arin/archive/2023/delegated-arin-extended-20230624.gz","retrieved_at":"2026-10-12T23:22:49+00:00","summary":"ARIN delegated statistics 2023-06-24 (produced 2023-06-24T13:00:11+00:00), after the report: allocated (dated 2023-06-23)"}]}],"classification_history":{"7a5257579f63cf45":[{"raw_change_id":182193,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.0","classified_at":"2026-10-13T03:59:23+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN) on 2023-06-23 12:13 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":182193,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.1","classified_at":"2026-10-13T08:07:29+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN) on 2023-06-23 12:13 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":182193,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.3.2","classified_at":"2026-10-13T14:50:19+00:00","current":0,"public_explanation":"ARIN's transfer log records a transfer from United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN) on 2023-06-23 12:13 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."},{"raw_change_id":182193,"classification_code":"INTRA_RIR_TRANSFER","confidence":"CONFIRMED","classifier_version":"1.4.0","classified_at":"2026-10-13T23:53:45+00:00","current":1,"public_explanation":"ARIN's transfer log records a transfer from United States Steel Corporation (ARIN) to SEI Data, Inc. (ARIN) on 2023-06-23 12:13 UTC. ARIN-Issued lists it as \"Add\" because the registration changed hands; it is not a new allocation from ARIN."}]},"arin_statistics_now":{"status":"allocated (dated 2023-06-23)"}}